in reply to
Using c executable in Perl Script
XS. Look at perldoc perlxs. However, you can supply your own sort routines written in Perl to Perl's sort function.
By rote learning.
Via Genetic memory.
It's provided by my firmware.
I just remember them.
Thirty days hath September
My computer gets it right, usually.
I just ask someone else.
Someone punches me on the first of the month.
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